Auto Changeover Operation - Fujitsu ABYG18KRTA Service Manual
Ceiling type air conditioner
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Also See for ABYG18KRTA:
- Design & technical manual (113 pages) ,
- Service manual (482 pages) ,
- Service manual (125 pages)
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2. Auto changeover operation
When the air conditioner is set to AUTO mode by remote controller, operation starts in the optimum
mode from among heating, cooling, dry and monitoring modes. During operation, the optimum mode
is automatically switched in accordance with temperature changes. The temperature can be set be-
tween 18°C and 30°C in 1.0°C steps.
• When operation starts, indoor fan and outdoor fan are operated for around 1 minute.
Room temperature and outdoor temperature are sensed, and the operation mode is selected in
accordance with the table below.
Room temperature
Ts + 2°C ≥ Tr ≥ Ts - 2°C
Tr: Room temperature
Ts: Setting temperature
NOTE: When the operation mode is middle zone, indoor unit operation mode is selected as below.
• Same operation mode is selected as outdoor unit.
If outdoor unit is operating in cooling and heating mode, indoor unit will be operated by
the same operation mode.
• Selected by outdoor temperature.
If outdoor unit is operating in other than cooling and heating mode, indoor unit will be op-
erated according to the outdoor temperature as below.
• When the compressor was stopped for 6 consecutive minutes by temperature control function af-
ter the cooling or heating mode was selected as above, operation is switched to monitoring mode
and the operation mode selection is done again.
• When the middle zone is selected on the predetermining of the operation mode, the operation
mode before the changing to the monitoring mode is selected.
Tr > Ts + 2°C
Tr < Ts - 2°C
Outdoor temp.
25°C or more
Less than 25°C
- (04-13) -
Operation mode
Cooling
Middle zone
Heating
Operation mode
Cooling
Heating
2. Auto changeover operation
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